65631256550 has 48 divisors (see below), whose sum is σ = 129426984000. Its totient is φ = 24675356160.

The previous prime is 65631256547. The next prime is 65631256571. The reversal of 65631256550 is 5565213656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 592451 + ... + 694449.

It is an arithmetic number, because the mean of its divisors is an integer number (2696395500).

Almost surely, 2^65631256550 is an apocalyptic number.

65631256550 is a deficient number, since it is larger than the sum of its proper divisors (63795727450).

65631256550 is a wasteful number, since it uses less digits than its factorization.

65631256550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102785 (or 102780 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 44.

The spelling of 65631256550 in words is "sixty-five billion, six hundred thirty-one million, two hundred fifty-six thousand, five hundred fifty".